UFO Sighting in Guangzhou, Guangdong on 2017-06-08 11:05:00 - Black strange object hovering

Hi, i clicked these images (attached herewith) while staring at sky from my iphone 7 plus. i clicked them on way from panyu to dongguan (guangdong province, china). the object vanished quickly when i was changing phone setting to video mode. earlier there were aeroplanes flying in same direction. so, i am very confident that this is not a aeroplane nor a drone. advise me what is this as i am curious to know if its some ufo or something else. p.S.; image 7362 is with 10x digital zoom. thanks.